The purpose of a good accident prevention poster is to place fear in the hearts and minds of workers, to make them fear breaking the rules, show them where breaking the rules can take them. And some of those classy vintage Soviet workplace posters are right on point with this. See them here, translated for you. First one above says “Take away your hair”.

Don’t use your leg to remove the belt.

Learn how to release the victim of electrocution – chop the wires with an axe.

We were way ahead of that in the Sixties. We saw the posters pretty much the same as pictured here, but we were also shown the movies, including all the gory details that would have shown up Quentin Tarantino as a simple choir boy.
I am still very careful around machinery. Fortunately the open belt drives were a thing of the past already in those days. But in India I saw them quite a lot, even in the seventies.